B007E code meaning
Driver Seat Belt Pretensioner C Deployment Control
What B007E means
B007E is the driver's third (C) pretensioner circuit. Mercedes-Benz fills this slot with the retractor: in LI54.21-P-070658 for the A-, CLA- and GLB-Class, B007E13 is an open circuit at the squib of the driver's emergency tensioning retractor, with B0079 for the belt end fitting tensioner and B0080 for the driver's belt force limiter. The retractor unit is housed either inside the B-pillar or within the seat and winds the spool back to remove slack from the shoulder belt, as GM and Joyson explain. The same Mercedes list puts the rear retractors on the C codes B00E3, B00E4, B00E6 and B00E7, so there the C stage consistently means the retractor. A stored B007E means the airbag lamp is on and the driver's shoulder belt will not be pretensioned.
B007E at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B007E
- Airbag warning lamp on
- Driver's shoulder belt is not tightened in a crash
- Safety note: the retractor holds a pyrotechnic charge; disconnect the battery, wait, and leave the work to a specialist workshop
Common causes of B007E
- Most likelyRetractor plug at the lower driver-side B-pillar loose or terminals spread
- PossibleHarness pinched by B-pillar or sill trim
- Less likelyInternal fault of the driver retractor pretensioner
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Driver pretensioner cSquib circuitSRS control module
What each part of B007E means
| B | Body system: airbags, seat belts, power seats, lights and climate control. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7E | The exact fault in that area. |
What to do next
- Note B007E and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about B007E
What does B007E mean?
B007E means "Driver Seat Belt Pretensioner C Deployment Control". B007E is the driver's third (C) pretensioner circuit. It is a generic code, so it means the same on every make.
Is it safe to drive with B007E?
B007E does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B007E fail an emissions test?
B007E is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is B007E to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will B007E clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.